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    Property profile & analytics

    101 William St Mount Prospect, IL 60056-3322

    • Residential income homes
    • 2,650 SF
    • 0.17 lot acres
    OFF-MARKET
    Value Estimations
    $375,000
    Show details
    Cap Rate Potential
    9.7%
    Residential income homes
    Location Intelligence
    Property ID
    US28-1809659
    The Realmo ID is a unique identifier assigned to every property, incorporating country codes and precise geo-coordinates for 300x300-foot land blocks. It enables standardized data collection and seamless integration of disparate sources such as ownership, tax, title data and physical specifications. By aggregating current and historical records, the Realmo ID powers advanced analytics and delivers deep, verifiable insights for real estate professionals.

    Current Use by Public Records

    • Residential income homes

    Property Details for 101 William St

    Year built
    1928
    Construction
    MASONRY/CONCRETE MASONRY UNITS (CMUS)
    Lot size
    0.17 lot acres
    Property size
    2,650 SF
    Property type
    Residential income homes
    Property subtype
    Small apartment buildings
    APN
    08-12-209-001
    APU
    812209001

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

      Method
      Estimation
      ML approach
      $355,000

    • CAP approach

      CAP Return
      Estimation
      6%
      $575,000
      6.5%
      $530,000
      7%
      $490,000

    • Comparable approach

      Method
      Estimation
      Statistic Estimate
      $551,000
      Market price range: $352k - $562k
      AI Estimate
      $377,000
      Market price range: $247k - $408k

    Get a detailed, property-specific valuation — fast and free

    Location Insight

    • Map
    • Local Demand
    City
    Mount Prospect
    County
    Cook
    State
    Illinois
    Longitude
    -87.9281
    Latitude
    42.0643
    CBSA code
    16980
    CBSA name
    CHICAGO-NAPERVILLE-JOLIET, IL-IN-WI METROPOLITAN STATISTICAL AREA

    Property Tax & Assessments

    Tax date
    Tax Amount
    Assessed Land Value
    Assessed Improvement Value
    Total Assessed Value
    Applied Tax Rate
    Land Market Value
    Improvement Market Value
    Total Market Value
    2022
    $11,309
    $7,220
    $38,425
    $45,645
    -
    $72,200
    $384,250
    $456,450

    Comparable in this City

    • Value Estimation
      $380,000
      2,743 SF

      905 Ardyce Ln

      APARTMENT HOUSE (UNDER 5 UNITS) • 2,743 SF
      905 Ardyce Ln, Mount Prospect, IL 60056-2631
      View Details
    • Value Estimation
      $360,000
      2,246 SF

      1103 Ardyce Ln

      APARTMENT HOUSE (UNDER 5 UNITS) • 2,246 SF
      1103 Ardyce Ln, Mount Prospect, IL 60056-2634
      View Details
    • Value Estimation
      $345,000
      3,446 SF

      1004 Ardyce Ln, Unit 1

      APARTMENT HOUSE (UNDER 5 UNITS) • 3,446 SF
      1004 Ardyce Ln, Mount Prospect, IL 60056-2633
      View Details
    • Value Estimation
      $380,000
      2,760 SF

      202 Catino Ct

      APARTMENT HOUSE (UNDER 5 UNITS) • 2,760 SF
      202 Catino Ct, Mount Prospect, IL 60056-2645
      View Details
    • Value Estimation
      $355,000
      3,748 SF

      530 Dempster St

      APARTMENT HOUSE (UNDER 5 UNITS) • 3,748 SF
      530 Dempster St, Mount Prospect, IL 60056-5389
      View Details
    • Value Estimation
      $360,000
      3,912 SF

      508 Ida Ct

      APARTMENT HOUSE (UNDER 5 UNITS) • 3,912 SF
      508 Ida Ct, Mount Prospect, IL 60056-5381
      View Details

    Similar Nearby for Sale

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    Similar Nearby for Lease

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      Oakton Industrial Space Available

      Mount Prospect warehouse/flex space for lease.
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      Retail space available in a busy shopping center.
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      Mount Prospect Office Space Available

      Office space for rent in a campus-like environment.
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      View Details
    • Contact for pricing
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      Retail Space at Signalized Intersection

      Retail space with high visibility and strong demographics in Mount Prospect.
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    • Contact for pricing
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      Mount Prospect Retail Space Available

      Retail space in a grocery and soft-goods anchored shopping center.
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      View Details
    • Contact for pricing
      3,748 SF

      Redeveloped Mixed-Use Center Retail Space

      Open-air mixed-use center with retail, office, and hotel space.
      201 Euclid Ave, Mt Prospect, IL 60056
      View Details
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    101 William St
    Mount Prospect, IL 60056-3322
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    Realmo Value Estimations

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.
    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.
    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

    More about this property
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